CVE-2021-20322

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Summary

CVECVE-2021-20322
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-02-18 18:15:09 UTC
Updated2026-07-30 19:33:26 UTC
DescriptionA flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem Types: CWE-330 | CWE-330 CWE-330

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
2.0[email protected]Primary5.8AV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None

AV:N/AC:M/Au:N/C:P/I:P/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Kernel affected 4.15 4.19.215 custom Not specified
CNA Na Kernel affected 4.20 5.4.146 custom Not specified
CNA Na Kernel affected 5.5 5.10.65 custom Not specified
CNA Na Kernel affected 5.11 5.13.17 custom Not specified
CNA Na Kernel affected 5.14 5.14.4 custom Not specified

References

ReferenceSourceLinkTags
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch, Vendor Advisory
Debian -- Security Information -- DSA-5096-1 linux af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch, Vendor Advisory
Oracle Critical Patch Update Advisory - July 2022 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Third Party Advisory
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch, Vendor Advisory
[SECURITY] [DLA 2941-1] linux-4.19 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
CVE-2021-20322 Linux Kernel Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch, Vendor Advisory
2014230 – (CVE-2021-20322) CVE-2021-20322 kernel: new DNS Cache Poisoning Attack based on ICMP fragment needed packets replies af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159741 Oracle Enterprise Linux Security Update for unbreakable enterprise kernel (ELSA-2022-9260)
  • 159825 Oracle Enterprise Linux Security Update for kernel (ELSA-2022-1988)
  • 178943 Debian Security Update for linux (DLA 2843-1)
  • 179117 Debian Security Update for linux (DSA 5096-1)
  • 179119 Debian Security Update for linux-4.19 (DLA 2941-1)
  • 180522 Debian Security Update for linux (CVE-2021-20322)
  • 198655 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5268-1)
  • 240275 Red Hat Update for kernel-rt (RHSA-2022:1975)
  • 240298 Red Hat Update for kernel security (RHSA-2022:1988)
  • 240390 Red Hat Update for kernel-rt (RHSA-2022:4835)
  • 240392 Red Hat Update for kernel security (RHSA-2022:4829)
  • 353161 Amazon Linux Security Advisory for kernel : ALAS-2022-1563
  • 354747 Amazon Linux Security Advisory for kernel : ALAS-2023-1688
  • 390258 Oracle VM Server for x86 Security Update for kernel (OVMSA-2022-0011)
  • 671181 EulerOS Security Update for kernel (EulerOS-SA-2021-2934)
  • 671219 EulerOS Security Update for kernel (EulerOS-SA-2022-1030)
  • 671225 EulerOS Security Update for kernel (EulerOS-SA-2022-1010)
  • 671252 EulerOS Security Update for kernel (EulerOS-SA-2022-1171)
  • 671288 EulerOS Security Update for kernel (EulerOS-SA-2022-1227)
  • 671304 EulerOS Security Update for kernel (EulerOS-SA-2022-1208)
  • 751399 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:1501-1)
  • 751406 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3806-1)
  • 751424 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3848-1)
  • 751436 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3877-1)
  • 751437 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3876-1)
  • 751441 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3876-1)
  • 751451 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3935-1)
  • 751462 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3941-1)
  • 751473 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3969-1)
  • 751476 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3972-1)
  • 751489 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 37 for SLE 12 SP3) (SUSE-SU-2021:4057-1)
  • 900692 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8673)
  • 906237 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8673-1)
  • 940517 AlmaLinux Security Update for kernel (ALSA-2022:1988)

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